This MR makes it possible to turn on PQ + Rec2020 on displays which support it with a bit of js magic in lg:
global.compositor.backend.get_monitor_manager().experimental_hdr = 'on'
global.compositor.backend.get_monitor_manager().experimental_hdr = 'off'In a future MR the string should contain the TF, Colorspace and HDR metadata instead of just an on/off switch for PQ + Rec2020. This is only intended to experiment with HDR modes and displays.